不同晶型锰氧化物去除地下水中氨的效能与机理

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摘要研究了3种不同晶型二氧化锰(α-MnO₂、γ-MnO₂、δ-MnO₂)去除地下水中氨的效能与机理,并考察了负载γ-MnO₂滤料填充滤柱实际应用效果.结果表明,γ-MnO₂催化氧化除氨效果最优(γ-MnO₂>α-MnO₂>δ-MnO₂),第20d 5mg/L氨可以被完全去除,且其中间产物亚硝酸盐氮的积累时间最短,峰值最低.γ-MnO₂负载滤料填充滤柱可以快速(第6d)具备优异的催化除氨能力,当进水氨为2.0mg/L时,出水氨低于标准限值(<0.5mg/L).结合材料表征分析结果发现,γ-MnO₂具备最优的催化氧化除氨能力主要是由于其较高的锰平均氧化态与其丰富的表面羟基氧,其电子传递能力最强.本研究为锰氧化物在饮用水除氨领域的应用提供了理论指导,γ-MnO₂负载滤料具有良好的催化氧化除氨稳定性和效能,为实际工程中催化氧化活性滤料的制备提供了新思路.

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	程亚
	苗安琪
	黄廷
	林文刚

关键词 ：晶型, 锰氧化物, 氨, 催化氧化, 地下水

Abstract：The efficiency and mechanism of removing ammonium from groundwater by manganese dioxide with three different crystal forms (α-MnO₂, γ-MnO₂, δ-MnO₂) were studied, and the practical application efficiency of the filter column filled with γ-MnO₂ coated filter media was investigated. The experimental results showed that γ-MnO₂ possessed the best catalytic oxidation activity for removing ammonium (γ-MnO₂>α-MnO₂>δ-MnO₂), 5mg/L NH₄⁺-N could be completely removed on the 20th day, and the accumulation time of nitrite was the shortest and the peak value was the lowest. The filter column filled with γ-MnO₂ coated filter media could quickly (the 6^th day) form excellent catalytic activity, when the influent NH₄⁺-N was 2.0mg/L, the effluent NH₄⁺-N was lower than the standard limit (<0.5mg /L). Combined with the characterization analysis, it was found that the highest catalytic activity of γ-MnO₂ was mainly due to its higher average manganese oxidation state and abundant surface hydroxy oxygen, and its electron transport ability was the strongest. This study provides theoretical guidance for the application of manganese oxides in the field of ammonium removal from drinking water. γ-MnO₂ coated filter media has good catalytic oxidation stability and efficiency, and provides a new perspective for the preparation of catalytic oxidation active filter media in practical engineering.

Key words： crystal forms manganese oxide ammonium catalytic oxidation groundwater

收稿日期: 2024-02-12

PACS:

X523

基金资助:国家自然科学基金(52000145);陕西省重点科技创新团队项目(2023-CX-TD-32);陕西省教育厅重点科学研究计划项目(22JY035);陕西省高校科协青年人才托举计划项目(20230447)

通讯作者: 黄廷,教授,huangtinglin@xauat.edu.cn E-mail: huangtinglin@xauat.edu.cn

作者简介: 程亚(1990-),女,山东济宁人,副教授,博士,主要研究方向为微污染水源水处理.发表论文20余篇.chengya@xauat.edu.cn.

引用本文:

程亚, 苗安琪, 黄廷, 林文刚. 不同晶型锰氧化物去除地下水中氨的效能与机理[J]. 中国环境科学, 2024, 44(9): 4978-4986. CHENG Ya, MIAO An-qi, HUANG Ting-lin, WEN Gang. Efficiency and mechanism of removing ammonium from groundwater by manganese oxides with different crystal forms. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(9): 4978-4986.

链接本文:

http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2024/V44/I9/4978

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